ensure divider list items have `role="separator"`
ensure divider list items have `role="separator"`

BS3 commits: 39137b9f4a26608988232f7d4966af280e46b689

aaroncnhk/todc-bootstrap,todc/todc-bootstrap,mozillo/todc-bootstrap,up2vs/todc-bootstrap,ztx1491/todc-bootstrap,2947721120/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap